Great burdock soup with corn and chinese herbs

Ingredients

• 300g pork ribs, cut into bite-size pieces
• 1-meter-long great burdock (牛蒡), brush off any muds on its skin while rinsing under cold running water, cut 2-inch lengthwise, and then into half
• 1 corn, cut across into approximately 2-inch thickness
• 3 pcs of dang gui (Pharmaceutical name : Angelica sinensis) 当归
• 5 pcs of dang shen (Pharmaceutical name : Codonopsitis Pilosulae) 党参
• 12 red dates (Chinese dates or red jujube) 红枣, halved and de-seeded
• 6 pcs of bei qi (Pharmaceutical name : Astragalus propinquus) 北芪
• 2 tbsp of qi zi (Chinese wolfberries or goji berries) 枸杞子
• 1500ml water